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Investments (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
security
state
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
security
state
Investment [Line Items]      
Number of individual states exceeding overall investment portfolio exposure | state 0   0
Maximum individual state exposure 0.50%   0.50%
Advance refunded or escrowed-to-maturity securities $ 281,102   $ 319,654
Percentage of revenue securities 52.00%   50.00%
Total other-than-temporary impairment losses $ 311 $ 3,208  
Net other-than-temporary impairment losses recognized in earnings 648 [1] 2,570  
Portion of net gain (loss) recorded as unrealized loss component of AOCI $ 337 $ (638)  
Percentage of securities representing gross unrealized losses 6.00%   5.00%
Percentage of gross unrealized losses in a continuous loss position less than twelve months 77.00%   88.00%
Individual securities comprising total gross unrealized losses | security 380   884
Percentage of residential mortgage-backed holdings exposure to sub-prime mortgage collateral 42.00%    
Maximum exposure to loss $ 224,255    
Unfunded commitments 30,853    
Minimum      
Investment [Line Items]      
Outstanding balance of commercial mortgage loans 13   $ 17
Maximum      
Investment [Line Items]      
Outstanding balance of commercial mortgage loans 14,515   14,625
Energy Sector | Corporate      
Investment [Line Items]      
Investment in securities 573,013   779,720
Unrealized gain (loss) on investments 1,365   (6,985)
Europe | Corporate Fixed Maturity and Equity Securities      
Investment [Line Items]      
Investment in securities 708,883   888,923
Unrealized gain (loss) on investments $ 62,581   $ 67,957
Investments | Internal Investment Grade | Energy Sector | Corporate      
Investment [Line Items]      
Percentage of investments held 82.00%   89.00%
Geographic Concentration Risk | Investments | Canada | Foreign Government Fixed Maturity Securities      
Investment [Line Items]      
Percentage of investments held 81.00%   79.00%
Geographic Concentration Risk | Investments | Brazil | Foreign Government Fixed Maturity Securities      
Investment [Line Items]      
Percentage of investments held 7.00%   8.00%
Geographic Concentration Risk | Investments | Germany | Foreign Government Fixed Maturity Securities      
Investment [Line Items]      
Percentage of investments held 5.00%   5.00%
Geographic Concentration Risk | Investments | Other Countries (less than 3%) | Foreign Government Fixed Maturity Securities      
Investment [Line Items]      
Percentage of investments held 3.00%   3.00%
Geographic Concentration Risk | Investments | Unspecified European Country | Corporate Fixed Maturity and Equity Securities      
Investment [Line Items]      
Percentage of investments held 4.00%   5.00%
Investment Sector Concentration Risk | Investments | Europe | Financial Services Sector | Corporate Fixed Maturity and Equity Securities      
Investment [Line Items]      
Percentage of investments held 23.00%   25.00%
Investment Hedging Concentration Risk | Investments | Europe | Pound and Euro Denominated | Not Hedged to U.S. Dollars | Corporate Fixed Maturity and Equity Securities      
Investment [Line Items]      
Percentage of investments held 8.00%    
[1] (a)2016 includes $146,727 related to the sale of Assurant Employee Benefits mainly through reinsurance transactions.